Evaporator



B. GOLDMAN Se t. 23, 1947.

EVAPORATOR Filed Feb. 8, 1945 INVENTOR WITNESSES: I

ATTORNEY Patented Sept. 23, 1947 UNlTED STATES ATENT OFFICE.

7 Claims.

This invention relates to new and useful improvements in evaporators or the like of the type for eifecting rapid evaporation for concentration of liquids, and it is among the objects thereof to provide evaporators in which the liquid is subjected to a steady continuous mixing action while exposed to heating or cooling walls with a strong circulatory motion and a minimum input of power. The present invention is a continuation-in-part of an application serially numbered 389,101, filed April 18, 1941.

The invention will become more apparent from a consideration of the accompanying drawing constituting a part hereof, in which Fig. l is a vertical cross-sectional View of an evaporator embodying the principles of this invention;

Fig. 2 a cross-sectional view thereof taken along the line 22 of Fig. l; and

Fig. 3 a detail of a portion of the central well with a modified form of impeller.

In the drawing, the numeral I generally designates a container in the form of a cylindrical housing having a base 2 and a cover 3 with a drain or outlet 4 at the base and an inlet 5 in the cover thereof. A transverse strut 6 is provided in the base for supporting a cylindrical rotor I which is mounted on an end bearing 8 and is provided with a drive shaft 9 that may be driven by a motor (not shown) mounted on the cover member 3. Disposed within the housing I above the base 2 are a plurality of partition walls It forming continuous annular passages connected at l! and I2 to conduits leading to a source of heating or cooling medium, hot Water or cooling liquid, as the case may be, to maintain circulation of such temperature controlling medium through the annular chambers i3 formed by the partition walls. Instead of the walls Iii, any suitable heat exchange surface may be employed.

Disposed centrally of the housing I is a well I4 having radially extending baffles I5, the top of the well having an inverted cup-shaped end IS with a central opening II for the passage of liquid into the well, as will be hereinafter explained. Baflies iii are provided at the top of housing I above the partition walls In and baflles B9 are provided below the heat exchange walls as shown. The cylindrical rotor I may be provided with perforations 20 but will also function with an imperforate surface.

In operation, assuming the container I to be filled with a liquid up to the top of the heat exchange walls I9, operation of the cylindrical I rotor! will set up circulation of'the liquid through the perforation 20 against the inner wall of the well I4, the centrifugal force causing displacement of the liquid through the cylinder 1 and around the heat exchange walls III, the circulation being normal to the direction of the rising vapors. The rising liquid will strike bafiles I 8 and be forced radially inwardly through openings, I'I intothe hollow rotor I.

The liquid rising inside of the Well by the centrifugal action of the cylindrical rotor will strike. baflies I5 and be cascaded. into. the cylindrical rotor from which it again flows downwardly to the bottom of the container. Without the baflies I5 there would. not be any directed circulation of the liquid within the well I 4, but by means of the end wall I6 and. the bafiles I5 the flow is diverted downwardly and the volume of liquiddisplacementin the base of the container is added through the top opening ITof the well by direction of, the baflles I8.

,The bottom, baiiles I9 aid. intheupward directional movement of the liquid, although this function may also be performed by the. circulating medium conduit I I and I2 In the modification shown in Fig. 3. a blade impeller 2.I is substitutedifor the cylindrical impeller! in which case the funnel member I6 and smallbafiies I5 may be eliminated Without impairi g the functionv of. the. bafiies. I8v and I9 which maintain the desired circulation.

By means of the above-described apparatus, the liquid. to be evaporated or concentrated is subjectedto a vigorous circulating action in heat exchange relation with the walls III of the container, which walls should-be of a design to not impede the flow of; the-liquid in its-directional movement fromv the bottomto the topof the evaporating chamber.

Although one embodiment of the invention has been herein illustrated and described, it will be evident to those skilled in the art that various modifications may be made in the details of construction without departing from the principles herein set forth,

Iclaim:

1. In an evaporator of the kind described, a substantially cylindrical chamber adapted to contain liquid to be evaporated, a plurality of concentric annular heat exchange casings to heat the liquid in the chamber, a hollow cylindrical rotor disposed axially within the innermost casing to agitate said liquid, an annular collar depending inwardly from the upper rim of the innermost casing, and a plurality of radialbafiies to support the casing from below and to aid the circulation of the liquid in the chamber by diverting same upward between the outer walls of the casings.

2. In a liquid treating device, a cylindrical housing having a well spaced from the side walls of said housing and a hollow cylindrical rotor in said well extending throughout the greater part of the well and below the same, said well being open at the top and having baffles beneath said opening and above said rotor extending radially from the wall of the well to divert the liquid flow from the outside to the inside of said rotor, and baflles above said well opening for diverting the liquid flow from the outside to the inside of said well.

3. In a liquid treating device, a cylindrical housin having a well spaced from the wall of said housing and a, hollow cylindrical rotor in said well extending throughout the greater part of the well and below the same, said well having a constricted opening at the top and having baffies beneath said opening extending radially from the wall of the well above the rotor to divert the liquid flow from the outside to the inside of said rotor within the well, and bafiles above said well opening for diverting the liquid flow from the outside to the inside of said well.

4. In a. liquid treating device, a cylindrical housing having a well spaced from the wall of said housing and a hollow cylindrical rotor in said well extending throughout the greater part of the well and below the same, heat exchange walls disposed in and around and forming flow passages on both sides of said well having connections with a source of temperature control medium, said walls being arranged to form a passage for the liquid to be treated inside and outside of said well, said well being open at the top and having baffles beneath said opening extending radially from the wall of the well above the rotor to divert the liquid flow from the outside to the inside of said rotor, and baflles above the heat exchange walls for intercepting the rising circular flow of the liquid to be treated and diverting the flow from the outside to the inside of said well.

5. Ina liquid treating device, a cylindrical housing having a well spaced from the wall of said housing and a hollow cylindrical rotor in said well extending throughout the greater part of the well and below the same, heat exchange walls disposed in and around and forming flow passages on both sides of said well having connections with a source of temperature control medium, said walls being arranged to form a passage for the liquid to be treated inside and outside of said well, said well being open at the top and having baiiles beneath said opening extending radially from the wall of the well above the rotor to divert the liquid flow from the outside to the inside of said rotor, baflies below the heat exchange walls for directing the liquid upwardly through the heat exchange flow passages, and bafiies above said heat exchange walls for intercepting the rising circular flow of the liquid to be treated and diverting the flow from the outside to the inside of said well.

6. In a liquid treating device a cylindrical housing having a well spaced from the wall of said housing, heat exchange walls disposed in and around and forming annular flow passages on both sides of said well having connections with a source of temperature control medium, impelling means extending below said well for exhausting the liquid from the well and displacing the same radially outward and upward by circular motion outside of said well, and bafiles above said heat exchange walls for intercepting the rising circular flow of the liquid to be treated and diverting the flow radially inward toward the center of said well.

7. In a liquid treating device a cylindrical housing having a well spaced from the wall of said housing, heat exchange walls disposed in and around and forming flow passages on both sides of said well having connections with a source of temperature control medium, impelling means extending below said well for exhausting the liquid from the well and diverting the flow radially outward and upward by circular motion outside of said well, bafiies below said heat exchange walls for directing the flow of liquid upward between said walls, and/bafiles above said heat exchange walls for intercepting the rising circular flow of the liquid to be treated and diverting the flow radially inward toward the center of said well.

BRONISLAW GOLDMAN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 134,706 Schultze Jan. 7, 1873 1,309,219 Ruth, Jr. July 8, 1919 574,282 Sebastian Dec. 29, 1896 1,958,939 Bullock May 15, 1934 1,031,666 Richmond July 2, 1912 1,560,826 Kirschbraum Nov. 10, 1925 1,335,398 Sieck et a1. Mar. 30, 1920 1,087,409 Tiemann Feb. 1'7, 1914 1,835,620 Webre Dec. 8, 1931 1,437,698 Wirth-Frey Dec. 5, 1922 1,958,078 Webre May 8, 1934 FOREIGN PATENTS Number Country Date 655,503 Germany 1938 318 Austria 1899 

